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Author Topic: The Biological Question Thread  (Read 50285 times)  Share 

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masonnnn

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Re: The Biological Question Thread
« Reply #315 on: October 27, 2010, 12:01:15 pm »
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could a probe really be RNA?
i mean RNA is only for translation and transcription... i don't think i've heard of it bonding to DNA...
though i suppose they have complementary bases so...maybe. hm
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stonecold

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Re: The Biological Question Thread
« Reply #316 on: October 27, 2010, 12:04:56 pm »
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Quote from: masonnnn on October 27, 2010, 12:01:15 pm
could a probe really be RNA?
i mean RNA is only for translation and transcription... i don't think i've heard of it bonding to DNA...
though i suppose they have complementary bases so...maybe. hm

For VCAA's purposes, just stick to DNA.  Doubt RNA is wrong though...
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Milkshake

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Re: The Biological Question Thread
« Reply #317 on: October 27, 2010, 12:43:04 pm »
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Yeh it can be RNA as well NOB Page 424: "This kind of probe is commonly a piece of single-stranded DNA (or RNA)"
« Last Edit: October 27, 2010, 04:02:48 pm by Milkshake »
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masonnnn

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Re: The Biological Question Thread
« Reply #318 on: October 27, 2010, 01:51:29 pm »
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Adaptive Radiation and Divergent Evolution; how would you define the difference between them?

and yeah true thanks, vcaa seem to say DNA so may as well just keep it simple and stick to just DNA probes.
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Re: The Biological Question Thread
« Reply #319 on: October 27, 2010, 01:53:26 pm »
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I read somewhere they were the same thing but not sure
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matt123

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Re: The Biological Question Thread
« Reply #320 on: October 27, 2010, 01:53:30 pm »
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AWMG brohz

u guys are all technical about this shit

just wing the exam

stop asking questions
ur too smart for me . and im getting jalous!

JUst winG it !

be SIKKKKKK and fkkk the exam upppp
goodlucklkkskdkkk

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golden

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Re: The Biological Question Thread
« Reply #321 on: October 27, 2010, 02:28:07 pm »
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Probes can be RNA but DNA is more often used in exams, etc. You pretty much can't go wrong stating DNA probes unless the question has specified that it used RNA probes or the probe contains uracil (etc.).

Adaptive radiation is divergent evolution except it involves different populations (usually many) adapting to a range of environment niches.
« Last Edit: October 27, 2010, 02:34:45 pm by golden »
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cypriottiger

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Re: The Biological Question Thread
« Reply #322 on: October 27, 2010, 02:39:39 pm »
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hey, i just did this question from lisachem 2010and need advice for marking. question was "name the method that would be used to determine the definite age for a 100 million year old fossilised fish" to which i responded "uranium-144 dating" but the answer is radioisotopic dating. is this still a correct answer or wrong?
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golden

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Re: The Biological Question Thread
« Reply #323 on: October 27, 2010, 02:45:01 pm »
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Quote from: cypriottiger on October 27, 2010, 02:39:39 pm
hey, i just did this question from lisachem 2010and need advice for marking. question was "name the method that would be used to determine the definite age for a 100 million year old fossilised fish" to which i responded "uranium-144 dating" but the answer is radioisotopic dating. is this still a correct answer or wrong?

Isn't the isotope of uranium usually used uranium-235?
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cypriottiger

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Re: The Biological Question Thread
« Reply #324 on: October 27, 2010, 02:46:11 pm »
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eh either way im wrong lol
but regardless would putting the actual technique instead the type of technique lose me the mark?
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matt123

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Re: The Biological Question Thread
« Reply #325 on: October 27, 2010, 02:47:11 pm »
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Quote from: cypriottiger on October 27, 2010, 02:46:11 pm
eh either way im wrong lol
but regardless would putting the actual technique instead the type of technique lose me the mark?
'

I would always go with " radiometric/radioisotopic dating"
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Re: The Biological Question Thread
« Reply #326 on: October 27, 2010, 02:50:09 pm »
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Quote from: cypriottiger on October 27, 2010, 02:39:39 pm
hey, i just did this question from lisachem 2010and need advice for marking. question was "name the method that would be used to determine the definite age for a 100 million year old fossilised fish" to which i responded "uranium-144 dating" but the answer is radioisotopic dating. is this still a correct answer or wrong?

The question stated 'name the method' rather than 'name a method' - you might lose a mark depending on the marker.
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masonnnn

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Re: The Biological Question Thread
« Reply #327 on: October 27, 2010, 03:47:11 pm »
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Quote from: golden on October 27, 2010, 02:50:09 pm
Quote from: cypriottiger on October 27, 2010, 02:39:39 pm
hey, i just did this question from lisachem 2010and need advice for marking. question was "name the method that would be used to determine the definite age for a 100 million year old fossilised fish" to which i responded "uranium-144 dating" but the answer is radioisotopic dating. is this still a correct answer or wrong?


The question stated 'name the method' rather than 'name a method' - you might lose a mark depending on the marker.

Better off just saying radioisotopic or radiometric and specify if it asks. ie. if it asked is carbon-14 usable to date this 1bajilion year old fossil? ... obviously not.
Our teacher said that you still get the mark if you specify the isotope BUT if you specify the wrong isotope for the age, you lose the mark. whereas if you just gave the general answer, you can't go wrong.


Quote from: golden on October 27, 2010, 02:28:07 pm
Probes can be RNA but DNA is more often used in exams, etc. You pretty much can't go wrong stating DNA probes unless the question has specified that it used RNA probes or the probe contains uracil (etc.).

Adaptive radiation is divergent evolution except it involves different populations (usually many) adapting to a range of environment niches.
So is this whereas divergent evolution only involves...two populations?
« Last Edit: October 27, 2010, 03:49:13 pm by masonnnn »
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Milkshake

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Re: The Biological Question Thread
« Reply #328 on: October 27, 2010, 04:03:51 pm »
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Can anyone describe the procedure of microarray technology and genetic screening?
Can't find a website that clearly explains them, and the notes I have just give a general answer, like "to detect the presence/absence of a particular allele", but it doesn't exactly say how it does that.
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TrueLight

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Re: The Biological Question Thread
« Reply #329 on: October 27, 2010, 04:59:40 pm »
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watch some youtube clips on microarrays they're okay
http://www.youtube.com/watch?v=VNsThMNjKhM
http://www.youtube.com/watch?v=SNbt--d14P4
http://www.youtube.com/watch?v=ui4BOtwJEXs

virtual lab
http://learn.genetics.utah.edu/content/labs/microarray/

it just shows you the relative level of expression of each gene between two samples... just a quantitative measure
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